Yes...they can generally be vented anywhere that you have a current vented water heater, and yes, they do require 110 power to operate.
The Rinnai's are great, just be sure you get the venting and the gas pressure/supply right and you will be off and running!
The Rinnai's are great, just be sure you get the venting and the gas pressure/supply right and you will be off and running!